Solid surface modification method and apparatus

Abstract

A liquid compound or a compound solution is kept in contact with the surface of a solid material, such as a synthetic resin, glass, metal, or ceramic, radiation selected from ultraviolet radiation, visible radiation, and infrared radiation is irradiated on the interface between the surface of the solid material and the liquid compound or compound solution to optically excite the surface of the solid material and the liquid compound or compound solution, thereby effecting substitution with a chemical species in the liquid compound or compound solution, depositing the chemical species, or performing etching with the chemical species. Preferably, a transparent window is kept in tight contact with the surface of a solid material to be treated, a thin layer of a liquid compound or of a compound solution is interposed between the surface of the solid material and the transparent window by using capillarity, and ultraviolet radiation, visible radiation, or infrared radiation is irradiated through the transparent window. With this treatment, the irradiated portion can be imparted with hydrophilicity, adhesion properties printing properties, a corrosion resistance, and conductivity.

Description

The present invention relates to a method of photochemically modifying the surface of a solid workpiece to be surface-treated, e.g., formed of a synthetic resin, glass, a metal, an animal or a plant, or a ceramic, by bringing a liquid compound in or a compound solution into contact with the surface of the solid workpiece preferably by using a capillary phenomenon, and irradiating the sample with light in this state. The present invention also relates to an adhesion method and a marking method using this surface modification method, and an apparatus for carrying out these methods.There are known a method in which for the purpose of modifying the surface of a fluoroplastic, which is difficult to adhere because of its small affinity for other substances, a fluoroplastic is immersed in a treatment solution comprising liquid ammonia or naphthalene containing metal sodium and tetrahydrofuran to modify the surface, as well as a method of chemically modifying the surface of a polyethylene o...

AI Technical Summary

Benefits of technology

Also, a partial side surface of a window is formed into a plane mirror, and ultraviolet radiation is irradiated obliquely from the side away from the side of the plane mirror such that light directly propagating through the window and light reflected by the internal plane mirror interfere with each other. The result is modification in a diffraction-grating form on the surface of the solid material via the window and a thin layer of a compound liquid film. Especially when the angle of incidence of ultraviolet laser light to be obliquely incident is maintained at a Brewster angle, only p-polarized light brings about interference, resulting in a high interference efficiency. When the surface of a material is modified in the form of a grating, e.g., when a hydrophilic group is substituted in a grating form by using a fluoroplastic material as a solid material to be treated, a hydrophilic or hydrophobic micro domain structure is formed. This allows easy formation of an antithrombotic material necessary for an artificial blood vessel or organ by the use of a fluoroplast

Problems solved by technology

Unfortunately, these conventional chemical modification methods have problems in that, in the case of a fluoroplastic, for example, the surface of a fluoroplastic material turns brown to make the surface layer brittle, resulting in peeling of the adhesive layer.

Consequently, no satisfactory adhesive strength can be obtained.

In addition, although the above conventional methods can modify an entire portion which is immersed, they cannot perform partial modification unless a photoresist is used as a mask.

Also, the treatment reaction is difficult to control, and dangerous chemicals must be used.

However, because of the lack of chemical affinity for an adhesive, a roughened surface formed acts as a stress concentration point, bringing about bonding breakdown.

This makes it impossible to obtain a high bonding strength.

In the

Images